The Kubota Z421 tractor tire size is front 13×5-6 and rear 24×12-14. Other tire setup data found for this model includes Front 13×5-6, Rear 24×9.5-14; Front 18×8.50-10, Rear 18×8.50-10, so confirm the wheel option before ordering.
Front tire13×5-6
Rear tire24×12-14
Front/rear setupDifferent front and rear tire sizes
Tire pressure17 PSI, 14 PSI
Rim diameter6 in front, 14 in rear
Ballast35 gal
Other setup foundFront 13×5-6, Rear 24×9.5-14; Front 18×8.50-10, Rear 18×8.50-10
Kubota Z421 Tire Size Details
Front tire size
13×5-6
Rear tire size
24×12-14
Front/rear setup
Different front and rear tire sizes
Other tire setup found
Front 13×5-6, Rear 24×9.5-14
Replacement tire size
Front 18×8.50-10, Rear 18×8.50-10
Front tire construction
Flotation/implement tire
Rear tire construction
Flotation/implement tire
Front section width
5 in
Rear section width
12 in
Front rim diameter
6 in
Rear rim diameter
14 in
Approx front overall diameter
about 13 in
Approx rear overall diameter
about 24 in
Tire pressure
17 PSI, 14 PSI
Loaded rear tire ballast / fluid capacity
35 gal
Tire Size Comparison Chart
Front rim diameter comparison
This model
6 in
Average
12 in
Low
8 in
High
16 in
Rear rim diameter comparison
This model
14 in
Average
16 in
Low
12 in
High
24 in
Benchmarks use typical low, average and high rim diameters for the sub-compact / compact tractor category, not scraped low/high outliers.
Kubota Z421 Extra Tire Notes
Tire size note
The Kubota Z421 uses different front and rear tire sizes in this data: front 13×5-6 (6 in rim, 5 in width) and rear 24×12-14 (14 in rim, 12 in width)
Multiple setup note
This data has more than one tire setup for the Kubota Z421. The main front/rear listing is Front 13×5-6, Rear 24×12-14. Other setup data found: Front 13×5-6, Rear 24×9.5-14; Front 18×8.50-10, Rear 18×8.50-10. This usually means different wheel, axle, turf/ag/industrial, or market options rather than one universal tire size
Pressure note
For the Kubota Z421 with front 13×5-6 and rear 24×12-14 tires, the pressure values captured in the answer are 17 PSI, 14 PSI. Tire pressure is load-dependent, so use this as a reference value rather than a universal setting
Ballast note
For the Kubota Z421 rear 24×12-14 tires, the ballast figure captured in the answer is 35 gal. Liquid ballast capacity can change by tire brand, fill percentage, wheel setup and ballast fluid type
Front/rear matching note
The Kubota Z421 data shows front 13×5-6 and rear 24×12-14. When changing either size, front/rear rolling circumference and lead/lag need to stay within the correct range
Official information note
Mistakes do happen. Tire sizes can change by year, axle, wheel/rim option, tyre brand, tread type and local market. Please check the tire sidewall, operator manual and official kubotausa.com website for official information.
